Patent US2990361A successfully refreshed from Google Patents.
US2990361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodialytic cells
Assignee: Permutit Co Ltd
•
Filing: 1958-11-17
•
Granted: 1961-06-27
•
Expires: 1978-11-17
Abstract
No abstract record available.
Inventors
- 👤 Solt George Stefan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:58
CPC Classifications
B; B01; B01D; B01D61/00; B01D61/42; B01D61/44; B01D61/46; B01D61/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
AN ELECTRODIALYSIS CELL COMPRISING END ELECTRODES AND A PLURALITY OF UNIT ASSEMBLED BETWEEN SAID ELECTRODES, EACH UNIT COMPRISING HOLLOW FRAME HAVING OPENINGS IN THE WALLS OF ITS OPPOSITE FACES, ONE OF SAID OPENINGS BEING LARGER THAN THE OTHER, A STACK WITHIN THE FRAME COMPOSED OF A PLURALITY OF ION-SELECTIVE MEMBRANCES HAVING SPACING MEANS THEREBETWEEN TO FORM A NUMBER OF COMPARTMENTS, SAID MEMBRANES BEING LARGER THAN THE SMALLER OF THE OPENINGS BUT NO LARGER THAN THE LARGER OPENING AND RESTING ON THE INSIDE OF THE WALL AROUND THE SMALLER OPENING, SO THAT AN ADDITIONAL COMPARTMENT IS FORMED WHERE TWO FRAMES MEET WHEN THE UNITS ARE ASSEMBLED TOGETHER, WHEREBY A CONTINUOUS ELECTRIC PATH IS PROVIDED THROUGH THE CELL FROM ONE ELECTRODE TO THE OTHER WHEN LIQUID IS PRESENT IN ALL THE COMPARTMENTS, SAID FRAMES HAVING CONNECTIONS FOR THE SUPPLY AND DISCHARGE OF LIQUIDS TO AND FROM SAID COMPARTMENTS.
Claim 2
Dependent Claim
146 words
AN ELECTRODIALYSIS CELL COMPRISING END ELECTRODES AND A PLURALITY OF UNIT ASSEMBLED BETWEEN SAID ELECTRODES, EACH UNIT COMPRISING HOLLOW FRAME HAVING OPENINGS IN THE WALLS OF ITS OPPOSITE FACES, ONE OF SAID OPENINGS BEING LARGER THAN THE OTHER, A STACK WITHIN THE FRAME COMPOSED OF A PLURALITY OF ION-SELECTIVE MEMBRANCES HAVING SPACING MEANS THEREBETWEEN TO FORM A NUMBER OF COMPARTMENTS, SAID MEMBRANES BEING LARGER THAN THE SMALLER OF THE OPENINGS BUT NO LARGER THAN THE LARGER OPENING AND RESTING ON THE INSIDE OF THE WALL AROUND THE SMALLER OPENING, SO THAT AN ADDITIONAL COMPARTMENT IS FORMED WHERE TWO FRAMES MEET WHEN THE UNITS ARE ASSEMBLED TOGETHER, WHEREBY A CONTINUOUS ELECTRIC PATH IS PROVIDED THROUGH THE CELL FROM ONE ELECTRODE TO THE OTHER WHEN LIQUID IS PRESENT IN ALL THE COMPARTMENTS, SAID FRAMES HAVING CONNECTIONS FOR THE SUPPLY AND DISCHARGE OF LIQUIDS TO AND FROM SAID COMPARTMENTS.
References Cited (Backward Citations)
US196254A
Cited
US1845316A
Cited
US1719754A
Cited
GB371837A
Cited
US2758083A
Cited
US2848403A
Cited
US2894894A
Cited
US2799644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-26 | 1964-12-26 | 1965-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-26 | 1968-12-26 | 1969-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-26 | 1972-12-26 | 1973-06-27 | $7700.00 | Window Closed / Lapsed |